How would you react if you saw a 30 year old climbing trees as a hobby for fun at the park?

How would I know it's a 30 year old?

Should be normalized. Climbing trees is good for your health.

Sounds like fun. I would do it too

Could be worse

I knew some 40 year old dude who went around on a skateboard so it's ridiculous but not surprising.

I guess if he was climbing Giant Redwoods that would be cool. Then you'd have the tearjerkers out there all OMG the tree!